package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author 勋谦
 * @ClassName: LoginInterceptor
 * @date: 2024/12/18 15:54
 * @Description: 刷新拦截器
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    // 此时不能使用Autowire了，因为这个类是我们自己创建的，需要写构造方法
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1. 获取请求头的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }

        // 2. 获取Redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);

        // 3. 判断用户是否存在(如果没有map的话，会返回空的map，此时不使用null)
        if (userMap.isEmpty()) {
            return true;
        }

        // 5. 将查询的hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);

        // 6. 存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        // 7. 刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 6. 放行
        return true;
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
